Davy Jones, members of the 1960s television show and pop band the Monkees, died on Wednesday of a heart attack in Florida at the age of 66.

One of voices behind the band’s biggest and most memorable hit, “I’m A Believer,” the Manchester, England, native joined the band in 1965. Two years later, the band, along with Jones, had their first of a handful of Billboard No. 1 with the song, which would later be made popular by a cover version featured in the film “Shrek.”

Twitter is already mourning the loss of the former teen idol, who also made several cameo appearances on children’s programs like “SpongeBob Squarepants” as a voice over talent. Jones also appeared on Broadway before his stint with the Monkees, which lasted until 1971.